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video: backlight: Add devres versions of of_find_backlight 

Add devm_of_find_backlight and the corresponding release
function because some drivers use devres versions of functions
for acquiring device resources.

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Meghana Madhyastha <meghana.madhyastha@gmail.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/021f8fecfa3f374dc5dcb70fb07a6f6b019bea7b.1516810725.git.meghana.madhyastha@gmail.com
hifive-unleashed-5.1
Meghana Madhyastha 2018-01-24 16:37:23 +00:00 committed by Sean Paul
parent c2adda27d2
commit 2e4ef3347b
2 changed files with 37 additions and 0 deletions
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30
drivers/video/backlight/backlight.c
View File

@ -623,6 +623,36 @@ struct backlight_device *of_find_backlight(struct device *dev)
}
EXPORT_SYMBOL(of_find_backlight);
static void devm_backlight_release(void *data)
{
backlight_put(data);
}
/**
* devm_of_find_backlight - Resource-managed of_find_backlight()
* @dev: Device
*
* Device managed version of of_find_backlight().
* The reference on the backlight device is automatically
* dropped on driver detach.
*/
struct backlight_device *devm_of_find_backlight(struct device *dev)
{
struct backlight_device *bd;
int ret;
bd = of_find_backlight(dev);
if (IS_ERR_OR_NULL(bd))
return bd;
ret = devm_add_action(dev, devm_backlight_release, bd);
if (ret) {
backlight_put(bd);
return ERR_PTR(ret);
}
return bd;
}
EXPORT_SYMBOL(devm_of_find_backlight);
static void __exit backlight_class_exit(void)
{
class_destroy(backlight_class);

7
include/linux/backlight.h
View File

@ -217,11 +217,18 @@ of_find_backlight_by_node(struct device_node *node)
#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
struct backlight_device *of_find_backlight(struct device *dev);
struct backlight_device *devm_of_find_backlight(struct device *dev);
#else
static inline struct backlight_device *of_find_backlight(struct device *dev)
{
return NULL;
}
static inline struct backlight_device *
devm_of_find_backlight(struct device *dev)
{
return NULL;
}
#endif
#endif